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The navy bean, haricot bean, pearl haricot bean, [3] Boston bean, [4] white pea bean, [5] or pea bean [6] is a variety of the common bean (Phaseolus vulgaris) native to the Americas, where it was first domesticated. [7] It is a dry white bean that is smaller than many other types of white beans, and has an oval, slightly flattened shape. [3]
White seeds are common, but black, red, orange, and variously mottled seeds are also known. The immature seeds are uniformly green. Lima beans typically yield 2,900 to 5,000 kg (6,400 to 11,000 lb) of seed and 3,000 to 8,000 kg (6,600 to 17,600 lb) of biomass per hectare. The seeds of the cultivars listed below are white unless otherwise noted.
As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root, and then penetrates down into the soil.After emergence of the radicle, the hypocotyl emerges and lifts the growing tip (usually including the seed coat) above the ground, bearing the embryonic leaves (called cotyledons), and the plumule that gives rise to the first true leaves.
When used as a dry grain for human consumption, the seeds are also called pulses. Legumes are grown agriculturally, primarily for human consumption, but also as livestock forage and silage, and as soil-enhancing green manure. Well-known legumes include beans, chickpeas, peanuts, lentils, lupins, mesquite, carob, tamarind, alfalfa, and clover.
Calypso beans, also called Panda beans or Yin Yang beans, are half black and half white, with one or two black dots in the white area. When young, the pods can be harvested as green beans. But when full-grown, they are used as a bean for drying. Cranberry: The cranberry beans originated in Colombia as the cargamanto bean. Borlotti or Roman ...
The word 'bean', for the Old World vegetable, existed in Old English, [3] long before the New World genus Phaseolus was known in Europe. With the Columbian exchange of domestic plants between Europe and the Americas, use of the word was extended to pod-borne seeds of Phaseolus, such as the common bean and the runner bean, and the related genus Vigna.
Seedling growth is also affected by mechanical stimulation, such as by wind or other forms of physical contact, through a process called thigmomorphogenesis. Temperature and light intensity interact as they affect seedling growth; at low light levels about 40 lumens/m 2 a day/night temperature regime of 28 °C/13 °C is effective (Brix 1972). [ 2 ]
Breaking dormancy, or finding the specific requirement of the seed, can be rather difficult. For example, a seed coat can be extremely thick. According to Evert and Eichhorn, very thick seed coats must undergo a process called scarification, in order to deteriorate the coating. [12] In other cases, seeds must experience stratification.